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Which of the following metal gives hydrogen gas, when heated with hot concentrated alkali

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$Zn$

$Ni$

$A g$

$Cu$

answer is C.

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Detailed Solution

$Zn + \underset{Conc.}{NaOH} \to \underset{Sodium zincate}{{Na}_{2} {ZnO}_{2}} + \underset{Hydrogen}{H_{2}}$

Thus in this reaction hydrogen gas is produced when zinc ·is treated with concentrated $NaOH .$

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